process.stdin.resume();
process.stdin.setEncoding('utf8');
 
// your code goes here
class Kamus {
  constructor() {
    this.data = {};
  }
 
  tambah(kata, sinonimArray) {
    if (!this.data[kata]) {
      this.data[kata] = new Set();
    }
 
    sinonimArray.forEach((s) => this.data[kata].add(s));
  }
 
  ambilSinonim(kata) {
    if (!this.data[kata]) {
      return null;
    }
 
    const sinonim = Array.from(this.data[kata]);
 
    if (sinonim.length === 0) {
      return [kata];
    }
 
    return sinonim;
  }
}
 
const kamus = new Kamus();
kamus.tambah('big', ['large', 'great']);
kamus.tambah('big', ['huge', 'fat']);
kamus.tambah('huge', ['enormous', 'gigantic']);
 
console.log(kamus.ambilSinonim('big'));
console.log(kamus.ambilSinonim('huge'));
console.log(kamus.ambilSinonim('gigantic'));
console.log(kamus.ambilSinonim('colossal'));
 

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